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Abstract

A number of Automatic Vehicle Location systems are in use now, however there is a need for an inex- pensive Personal Location System for determining location of a person or persons within a building.

Copyright

Motorola Inc. July 1991

Country

United States

Language

English (United States)

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@ MOTOROLA INC. Technical Developments Volume 13 July 1991

PERSONAL LOCATION/ALARM SYSTEM

by Charles R. Allison

A number of Automatic Vehicle Location systems are in use now, however there is a need for an inex- pensive Personal Location System for determining location of a person or persons within a building.

BASIC SYSTEM DESCRIPTION

The system described here is a personal alarm and location system for reporting alarms and location in a building or buildings. A pager size transmitter, worn by a person, would send an alarm transmission along with location information to a fixed location when an emergency button was depressed. The alarm and loca- tion information would then be displayed on a com- puter. The building or buildings to be covered would be equipped with infrared or ultrasonic location encoding devices that would keep the personal alarm transmitter updated as to location.

DETERMINING LOCATION

Each room or hallway where location information is to be available would be equipped with an infrared or ultrasonic sending unit which would constantly be emitting a coded signal. The number of sending units required depends on the accuracy required in the sys- tem. The alarm transmitters (worn on the person) would be equipped with an infrared or ultrasonic detector that would receive and decode the location signal. The room location would then be stored in memory in the transmitting unit to be sent via radio to the alarm receiver. Since the location information will be stored in memory, the personal transmitter does not have to be within range of an encoding unit at all times. If the person is in a room that is not equipped with a location encoder, the location of the last room equipped with an encoder will be sent. When sending the location, both the transmitter code and the room location code would be sent to the alarm receiver. The location and transmitter code would be received by the alarm receiver and sent to the computer via RS232 port. The computer would then decode the transmitter and location codes and display the information in plain text.